<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>子页面</title>
</head>

<body>
  <button id="btn">关闭页面</button>
  <script>
    function closeCurrent () {
      console.log(window.opener);
      console.log('关闭页面');
      // window.close()
    }

    document.body.querySelector('#btn').addEventListener('click', closeCurrent)
  </script>
</body>

</html>